In LOTR: The Fellowship of The Ring (2001), you can see Pippin playing in the band at Bilbo's party, before his proper introduction. Confirmed by Billy Boyd on the DVD commentary. :
Was Bilbo in the right when he took the ring? - Quora
Kostýmy Hobit: Frodo & Bilbo Pytlík. Expresní doručení | Funidelia
The potential return of Bilbo in The Rings of Power - Crast.net